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How do quiescent prominences differ from transient prominences?
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Joshua trees at sunset, Joshua Tree National Park, southern California, U.S.
In the study of solar prominences, these phenomena are categorized into two primary types based on their behavior, duration, and association with solar activity:
Quiescent Prominences
- Longevity: These are long-lived structures that emerge smoothly and can remain visible for several months.12
- Association: They are linked to large-scale magnetic fields, typically marking the boundaries of unipolar magnetic regions or sunspot groups.2
- Structure: They exist as two-dimensional suspended sheets and may take various forms, such as hedgerows, funnels, or suspended clouds.2
- Dynamics: They exhibit little internal motion and are characterized by low excitation, as they lack an energy source other than minor conduction from the corona.2
Transient Prominences
- Longevity: These are short-lived, erupting quickly over periods ranging from several minutes to a few hours.1
- Association: They are integral parts of solar activity, often occurring as the aftermath of flares or associated with sunspot groups.12
- Types: This category includes sprays, surges, and loop prominences.2
- Dynamics: Unlike quiescent prominences, loop prominences show high-excitation lines because they are cooling from extremely hot post-flare coronal condensations.2